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The ILLIAC-4 hardware is described. The Illiac system, the Advanced Research Projects Agency computer network, and IMLAC PDS-1 are included. The space shuttle flow simulation is demonstrated to show the feasibility of using an advanced computer from a remote location. Topics: ELECTRIC GENERATORS, REACTOR DESIGN, SNAP 8, NUCLEAR ELECTRIC POWER GENERATION, REACTOR TECHNOLOGY

197

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The dielectric constants of several soil samples were measured at frequencies of 5 and 19 GHz using the infinite transmission line method. The results of these measurements are presented and discussed with respect to soil types and texture structures. A comparison is made with other measurements at 1.4 GHz. At all three frequencies, the dependence of dielectric constant on soil moisture can be approximated by two straight lines. At low moisture, the slope is less than at high moisture level.... Topics: NONEQUILIBRIUM RADIATION, REACTOR DESIGN, REACTOR PHYSICS, THERMAL REACTORS, COHERENT...

109

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THE ARTICLES PRESENTED IN THIS COLLECTION OF WORKS TELL THE LATEST ACHIEVEMENTS IN SOVIET COSMONAUTICS: THE REGULAR EXPEDITION OF COSMONAUTS TO THE MIR ORBITAL SPACE STATION, AND THE SUCCESSFUL DEVELOPMENT OF USSR INTERNATIONAL COOPERATION IN THE SPHERE OF COSMONAUTICS. INFORMATION IS ALO PRESENTED ON THE START OF OPERATION OF THE JAPANESE BOOSTER ROCKET. Topics: ATOM CONCENTRATION, HYDROGEN, LASER INDUCED FLUORESCENCE, NEUTRAL GASES, REACTOR DESIGN, TOKAMAK...

292

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Two insulation systems for tanks containing liquid methane in supersonic cruise-type aircraft were designed and tested after an extensive materials investigation. One system is an external insulation and the other is an internal wet-type insulation system. Tank volume was maximized by making the tank shape approach a rectangular parallelopiped. One tank was designed to use the external insulation and the other tank to use the internal insulation. Performance of the external insulation system... Topics: FLUIDIZED BED PROCESSORS, NUCLEAR PROPULSION, PERFORMANCE TESTS, REACTOR DESIGN, REACTOR PHYSICS,...

257

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Engine-nozzle airframe integration at hypersonic speeds was conducted by using a high-speed research aircraft concept as a focus. Recently developed techniques for analysis of scramjet-nozzle exhaust flows provide a realistic analysis of complex forces resulting from the engine-nozzle airframe coupling. By properly integrating the engine-nozzle propulsive system with the airframe, efficient, controlled and stable flight results over a wide speed range. Topics: ENGINE TESTS, NUCLEAR ENGINE FOR ROCKET VEHICLES, REACTOR DESIGN, PROJECT PLANNING, PROPULSION...

132

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A simple model is suggested to do long-range planning cost estimates for Deep Space Network (DSP) support of future space missions. The model estimates total DSN preparation costs and the annual distribution of these costs for long-range budgetary planning. The cost model is based on actual DSN preparation costs from four space missions: Galileo, Voyager (Uranus), Voyager (Neptune), and Magellan. The model was tested against the four projects and gave cost estimates that range from 18 percent... Topics: CALCIUM, CHEMICAL REACTIONS, DAYTIME, ESTIMATING, HEAT TRANSFER, HYDROXIDES, MASS RATIOS, WATER,...

277

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Terrestrial animals have adapted to a constant gravitational stress over millions of years. Tissues of the cardiovascular system and lumbar spine in tall species of animals such as the giraffe are particularly well adapted to high and variable vectors of gravitational force. Swelling of the leg tissues in the giraffe is prevented by a variety of physiological mechanisms including (1) a natural 'antigravity suit', (2) impermeable capillaries, (3) arterial-wall hypertrophy, (4) variable blood... Topics: MANNED MARS MISSIONS, CYLINDRICAL BODIES, EXHAUST SYSTEMS, FISSIONABLE MATERIALS, HIGH TEMPERATURE,...

199

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Polybenzimidazoles (PBIs) are heterocyclic macromolecules commonly prepared by the condensation reaction of an aromatic bis(o-diamine) with an aromatic diacid or derivative thereof. These polymers possess high thermal, thermooxidative, and chemical stability; good mechanical properties; and excellent flame resistances, making them high-performance/high-temperature materials which are attractive for use in harsh environments. However, despite these properties, the processing of these polymers is... Topics: HEAT EXCHANGERS, HEAT PIPES, SHUTDOWNS, TEMPERATURE EFFECTS, HEAT TRANSFER, LUNAR BASED EQUIPMENT,...

145

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The Search for Extraterrestrial Intelligence, currently being planned by NASA, will require that an enormous amount of data be analyzed in real time by special purpose hardware. It is expected that overlapped Hann data windows will play an important role in this analysis. In order to understand the statistical implication of this approach, it has been necessary to compute detection statistics for overlapped Hann spectra. Tables of signal detection statistics are given for false alarm rates from... Topics: ENGINE DESIGN, INTERPLANETARY FLIGHT, REACTOR DESIGN, SAFETY, SPACE MISSIONS, NUCLEAR ENGINE FOR...

121

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The dilatational dissipation rate within compressible homogeneous turbulent shear flow is studied using data from direct numerical simulations. It is found that the dilatational dissipation rate is mainly associated with large scale acoustic waves. Eddy shocklets are observed; however, they have little contribution to the average dissipation rate. A mechanism for the generation of eddy shocklets is shown to be the focusing of acoustic waves. Turbulence models for the dilatational dissipation... Topics: MANNED MARS MISSIONS, NUCLEAR ELECTRIC PROPULSION, NUCLEAR FUELS, REACTOR DESIGN, MIRROR FUSION,...

306

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The design and manufacture of textile composite panels, tubes, and angle sections that were provided to NASA for testing and evaluation are documented. The textile preform designs and requirements were established by NASA in collaboration with Boeing and several vendors of textile reinforcements. The following four types of preform architectures were used: stitched uniweave, 2D-braids, 3D-braids, and interlock weaves. The preforms consisted primarily of Hercules AS4 carbon fiber; Shell RSL-1895... Topics: FUSION REACTORS, DESIGN ANALYSIS, LOW EARTH ORBITS, MAGNETIC MIRRORS, NUCLEAR FUELS, MIRROR FUSION,...

83

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To debug a C Language Integrated Production System (CLIPS) program, certain 'historical' information about a run is needed. It would be convenient for system builders to have the capability to request such information. We will discuss how historical Rete networks can be used for answering questions that help a system builder detect the cause of an error in a CLIPS program. Moreover, the cost of maintaining a historical Rete network is compared with that for a classical Rete network. We will... Topics: NUCLEAR FUEL ELEMENTS, GENERAL OVERVIEWS, REACTOR CORES, REACTOR TECHNOLOGY, NUCLEAR REACTORS,...

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This report covers the activities performed in the Drop Tube Study which The University of Alabama in Huntsville designed, fabricated and performed various low gravity experiments in materials processing from November 1, 1991 through October 30, 1992. During the performance of this contract the utilization of these ground-based containerless processing facilities has been instrumental in providing the opportunity to determine the feasibility of performing a number of solidification experiments... Topics: BRAYTON CYCLE, NUCLEAR ELECTRIC PROPULSION, NUCLEAR FUELS, REACTOR DESIGN, REACTOR TECHNOLOGY,...

578

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A second-generation, Stirling-cycle cryocooler (cryogenic refrigerator) for space applications, with a cooling capacity of 5 watts at 65 K, was recently completed. The refrigerator, called the Prototype Model, was designed with a goal of 5 year life with no degradation in cooling performance. The free displacer and free piston of the refrigerator are driven directly by moving-magnet linear motors with the moving elements supported by active magnetic bearings. The use of clearance seals and the... Topics: CONFERENCES, CONTROLLED FUSION, LASER PROPULSION, LUNAR BASES, MANNED MARS MISSIONS, NASA PROGRAMS,...